i just noticed that my lap top and desktop pc's have different TT versions installed. lappy is v3 d/t is v1.9. 1.9 shows way more stuff with my 98 bin vs the v3.
its shows some cat count stuff. once my wideband is installed ill see if turning this off in a 98 makes a difference or not. cause we know we say you can just delete the codes and thats it in a 97-00.
that being said if your not seeing the cat diag in your tt, it maybe the version your using.
and edit: i just tried a 05 gtp bin in tt with the v3 and its fails to show the cat diag, where it shows in 1.9.